There's been conflicting information about Crytek's Wii U ambitions for a while, particularly in regards to Crysis 3. The latest word is no: at this time, there aren't any plans to put a version of Crysis 3 on Wii U.

Just to answer the speculation, we are not currently working on a wiiU [sic] version of #Crysis3.

There's still room in that statement to wish for a version of the game on the console in the future, but for now the answer seems quite clear: there won't be a version of Crysis 3 on Wii U. Best not to keep those hopes up.